2003 Pontiac Grand Am Rear Window Defroster

SKI2FISH

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8 POSTS

2003 PONTIAC GRAND AM

V6

FWD

AUTOMATIC

145,000 MILES

The rear window defroster only clears a spot about the size of a silver dollar after about 15 minutes of use. I have checked and there is voltage to the grid. As I check the voltage across the grid, I have full voltage up to the ground terminal. I checked the voltage at the ground terminal and there is a drop in voltage of 2-3 volts. I checked the ground wire with an ohm meter and it is fine. If I check the resistence between the ground terminal on the defroster and the grid, I get a reading of about 120 with the meter on the 10k scale. I am assuming the is a problem with the ground tab's connection with the grid. Is there a way to fix this without replacing the window or the whole defroster grid?

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Friday, June 6th, 2014 AT 8:05 AM

3 Replies

JACOBANDNICKOLAS

EXPERT

68,494 POSTS

Chances are there are breaks in the grid itself. The only way I know of fixing it is replacement.

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Friday, June 6th, 2014 AT 9:20 AM

SKI2FISH

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There are no breaks in the grid

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Friday, June 6th, 2014 AT 12:44 PM

JACOBANDNICKOLAS

EXPERT

68,494 POSTS

If you drop 2 or 3 volts on the ground side, something is causing it to drop.